The wise man doesn't give the right answers, he poses the right questions.

The world began without man, and it will complete itself without him.

I have never known so much naive conviction allied to greater intellectual poverty.

Just as the individual is not alone in the group, nor anyone in society alone among the others, so man is not alone in the universe.

I hate travelling and explorers

Nor must we forget that in science there are no final truths.

There is today a frightful disappearance of living species, be they plants or animals. And it's clear that the density of human beings has become so great, if I can say so, that they have begun to poison themselves. And the world in which I am finishing my existence is no longer a world that I like.